Summary & Overview
CPT 21485: TMJ Dislocation Reduction with Fixation
CPT code 21485 represents closed reduction of a dislocated temporomandibular joint (TMJ) with application of a fixation device to prevent jaw movement during healing. This procedure addresses acute jaw locking and pain that can impair airway, nutrition, and oral function. Nationally, coding for TMJ dislocation reduction matters for accurate procedure reporting, appropriate site-of-service placement, and ensuring correct surgical and emergency care claims.
Key payers typically relevant to pricing and coverage discussions include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context, expected sites of service, and the common billing modifiers and payment considerations associated with this procedure. The publication outlines benchmarks and policy-relevant points such as coding specificity, typical utilization settings, and payer coverage patterns where available.
This summary equips clinicians, coders, and policy analysts with the essential background on CPT code 21485, clarifies where the service is commonly delivered, and frames the topics covered in detail later: clinical indications, billing nuances, payer coverage notes, and typical procedural workflow. Data not available in the input will be identified in the detailed sections.
Billing Code Overview
CPT code 21485 describes treatment for temporomandibular joint (TMJ) dislocation in which the provider reduces a jaw that is locked open and then applies a fixation device to restrict movement during healing. The procedure includes manual manipulation to relocate the mandibular condyle into the glenoid fossa followed by application of a fixation method to stabilize the joint.
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Service type: Closed reduction of TMJ dislocation with fixation
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Typical site of service: Ambulatory surgical center or hospital outpatient setting; may also be performed in an emergency department when immediate reduction is required
Clinical & Coding Specifications
Clinical Context
A 42-year-old male presents to the oral and maxillofacial surgery clinic after acute onset of an open-locked jaw following wide mouth opening during yawning. The patient reports immediate severe preauricular pain, inability to close the mouth, drooling, and difficulty speaking. On exam, the mandible is held in an anteriorly displaced position with limited mandibular function, and palpation reproduces pain at the temporomandibular joint. After attempts at closed reduction in the emergency department are unsuccessful or only temporarily successful, the oral and maxillofacial surgeon performs a closed or open reduction of the temporomandibular joint dislocation and applies jaw fixation (intermaxillary fixation or external fixation device) to immobilize the mandible during initial healing. The clinical workflow includes pre-procedure assessment (vital signs, airway evaluation, informed consent), procedural sedation or general anesthesia as indicated, manipulation to reduce the dislocation, placement of fixation (wiring, arch bars, or other fixation device), post-procedure radiographs as needed to confirm reduction, pain control, and discharge instructions including diet modification and follow-up within 1–2 weeks for fixation management and functional rehabilitation.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when work or complexity substantially exceeds typical for 21485 due to extensive manipulation, prolonged procedure time, or additional dissection for open reduction. |
23 | Unusual anesthesia | Use when general anesthesia is required for this otherwise local/regional procedure due to patient condition or procedural complexity.
26 | Professional component | Use when reporting only the professional technical interpretation component of a service (rare for this procedure; applicable to separately reported imaging interpretations).
50 | Bilateral procedure | Use when identical TMJ reduction/fixation is performed on both left and right temporomandibular joints during the same operative session.
51 | Multiple procedures | Use when 21485 is billed with other distinct surgical procedures the same day; append to secondary procedures as payer rules require.
52 | Reduced services | Use when a partial service is performed (e.g., attempted reduction without complete fixation) and full procedure is not completed.
53 | Discontinued procedure | Use when the procedure is terminated due to unforeseen complications before completion.
62 | Two surgeons | Use when two surgeons of different specialties work together as primary surgeons performing distinct portions of the reduction/fixation.
78 | Return to operating room for related procedure following prior anesthesia | Use when patient requires subsequent operative intervention for management or revision of the initial TMJ reduction/fixation during the global period.
79 | Unrelated procedure or service by the same physician during the postoperative period | (Not in provided list — excluded.) | (Not listed.)
LT | Left side | Use to identify procedures performed on the left temporomandibular joint when side-specific billing is requested.
RT | Right side | Use to identify procedures performed on the right temporomandibular joint when side-specific billing is requested.
QK | Medical direction of two, three, or four concurrent anesthesia cases | Use when the surgeon provides care requiring concurrent anesthesia direction (anesthesia-specific modifier; included from input list as applicable in operative context).
QX | CRNA service with anesthesiologist medically directing | Use when CRNA furnishes anesthesia under medical direction and reporting requires QX.
QY | Medical direction of one CRNA by an anesthesiologist | Use when anesthesiologist medically directs a single CRNA case.
| Taxonomy Code | Specialty | Notes |
|---|---|---|
207P00000X | Oral and Maxillofacial Surgery | Primary specialty that performs TMJ reductions and fixation. |
207L00000X | Plastic Surgery | May perform complex facial/jaw fixation and open reductions.
207K00000X | Otolaryngology (ENT) | May manage TMJ dislocations when associated with head and neck trauma or airway concerns.
208800000X | General Surgery | Occasionally involved for complex craniofacial trauma requiring multidisciplinary care.
2080S0122X | Hospitalist / Emergency Medicine (ED) | Initial closed reductions or sedation-assisted maneuvers in the emergency department prior to definitive OMFS care.
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
S03.4XXA | Sprain and strain of jaw, initial encounter | Acute soft-tissue injury associated with TMJ dislocation and painful mandibular dysfunction; used when sprain/strain present. |
S03.5XXA | Dislocation of jaw, initial encounter | Direct diagnosis for jaw dislocation; indicates acute management including reduction and fixation.
M26.60 | Temporomandibular joint disorder, unspecified | Used for TMJ dysfunction that may predispose to dislocation or require surgical intervention.
M26.61 | Temporomandibular joint disorder, acute | Indicates acute TMJ pathology relevant to recent dislocation and procedural treatment.
S02.6XXA | Fracture of mandible, initial encounter for closed fracture | Included when mandibular fracture is present concomitantly and fixation addresses both fracture and joint stability.
K07.6 | Temporomandibular joint disorders, not elsewhere classified | Alternate code for TMJ pathology associated with chronic instability and recurrent dislocations.
G44.209 | Temporomandibular disorders with associated pain (not specific) | Used to capture pain-dominant presentations requiring intervention and stabilization.
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
21485 | Open treatment of temporomandibular joint dislocation; includes reduction and fixation | Primary procedure for reduction and fixation of TMJ dislocation (the code in context). |
21470 | Open treatment of temporomandibular joint disorder, including prosthetic reconstruction when performed (separate code for complex joint procedures) | May be used for complex open TMJ procedures or reconstructive operations performed during the same operative episode.
21045 | Treatment of mandible fracture, open; with external fixation or intermaxillary fixation | Used when concomitant mandibular fracture repair with fixation is required alongside TMJ reduction.
41899 | Unlisted procedure, dentoalveolar structures | Used only when a specific fixation device or novel technique is employed not represented by established codes (payer approval often required).
70346 | CT scan, temporomandibular joint | Preoperative or postoperative imaging to assess joint position and hardware placement; billed separately when imaging is done and reported.
70336 | MRI temporomandibular joint | Advanced imaging for evaluation of soft tissue structures if indicated in planning or follow-up.